Security system housing



FIG. 1 is a front perspective view of a security system housing showing my new design;

FIG. 2 is a rear perspective view of the security system housing showing my new design;

FIG. 3 is a left side elevation view of the security system housing showing my new design;

FIG. 4 is a front elevational view of the security system housing showing my new design;

FIG. 5 is a rear elevational view of the security system housing showing my new design;

FIG. 6 is a bottom view of the security system housing showing my new design; and,

FIG. 7 is a top view of the security system housing showing my new design. 

The ornamental design for a security system housing, as shown and described. 